Electric controller.



L. A. DE MAYO. ELECTRIC CONTROLLER. APPLIOATION rum) 11.20, 1909.

Patented Aug. 1, 1911 ATTORNEY board or'panel of the apparatus.

UNITED STATES PATENT. OFFICE.

' LOUIS A. DE MAYO, OF NEW YORK, N. Y.

ELECTRIC CONTROLLER. I

To allfiuhom. it may concern:

Be'it-known that I, Lou-is A. on MAYO, of N ew'York, in the county of New York and State of New York, have invented certain new and useful Improvements in Electric Controllers, of which the following is a full,

*clear, and, exact specification, such as will enable others skilled in the art to which it appertains to make and use the same.

. The invention is adapted especially as a controller for electric motors, although it may be employed in- ;various electric circuits for the control of various apparatus.

Primarily the obj ectof my invention is to improve the automatic cut-out and to render the same more certain and efiicient in operation ,without increasing its complication or the cost of production.

The invention involvesvarious other features and all ofthem will be fully set forth hereinafter and particularly pointedout in the claims.

-Reference is .now had to the accompany- "ing drawings which represent, as an example, the. preferred embodiment of my in vention.

In these drawingsFigure 1 is a face view of the apparatus; Fig. 2 is an enlarged detail section on the line -2-2 of Fig. 1;

and Fig.3- is a section on. the line. 33 of.

Fig. 1.

In the drawings, 10 indicates the back This is preferably formed of an asbestos compound though-it may, be of any insulating ma terial.

On the panel 10 is arranged the main switch 11. The panel also carries various suitable connections 12 with the resistance (not shown) and fuses 1 1. This main switch 11 controls the circuit and is closed when the controller is in operation.

15 indicates the contacts with the resistance which. are arranged in an arc and at one end of which is the dead point 16. Over the-contacts 15 and dead point 16 is adapted to operate the controller arm 17 which swings around a pivot 18 on the panel. 10 and engages an are shaped contact 19 so that the current passes from said contact through one or moreof the resistance units ,shown in Fig. 3 with a spring 22,/by means v I Specification of Letters Patent. Patented, Aug, 1, 1911. Application mama. 20, 1909. Serial No. 484,797.

merit should the cut-out arm 20 be in the lower position shown by broken linesin Fig.

1, when the controller arm 17 is thrown to the dead polnt 16, the-toes 23 and 24 engage each other and. the arm 20 is automatically returned. a

The current passes through the controller arm 20 from its pin 21 to a U-shaped contact 25, which is in two parts between which the.

arm 20 is engaged when raised (see Fig. 2.)

"The arm 20v is adapted to be held in the raised position shown in Figs. 1 and 2 by means of an elbow-shaped detent 26, pivoted on a stud 27 fastened to the panel. This detent 26 has a hook 28 at one end which engages the free end of the arm 20 and its other arm is adapted to be engaged by a collar 29 on the core 30 of a solenoid magnet 31. The magnet 31 is fastened to the panel and is so wired that the current passes through it on its way to the motor or other apparatus in connection with which the con troller is employed. The upper side of the end of the arm 20 that engages with the hook 28 is provided with an elongated inclined riding surface, whereby, when the arm 20 is returned to closed position bythe controller arm 17, the arm 20 automatically latches by the hook 28, to be reengaged thereby.

- In the operation of the apparatus to start the motor, for example, the main switch 11 is closed, the controller arm .17 normally lying in the position shown in Fig. 1. At this time the circuit is still broken. The operator should then swing'the controller arm over the contacts 15, closing the circuit and gradually reducing the resistance as the controller arm is moved rightward. Should the'current passing to the motor exceed the limit fixed by the solenoid magnet 31. said magnet will become energized and lift its core 30, causing the collar 29 to strike the elbow detent 26 and disengage the hook 28 from the cut-out arm. The spring 22 then asserts itself and the cut-out arm instantly falls to the posit-ion shown by broken lines in Fig. 1. The circuit is then broken by the disconnection oft-he arm 20 from the contact 25 and. ofcourse, theaoperation of the motor ceases. The operator then returns the controller arm to the dead point as illus* trated in Fig. 1 and, by this operation, the.

ters Patent of the United States is:-

1. In an electric controller the combina tion of the controller arm adapted to make contact with the resistance contacts and with a dead point, a cut-out arm, a stud on which said arm, is mounted, said stud serving as a terminal, a depending U-shaped contact ,having inflexible legs adapted to make contact with said cut-out arm, means normally tending to hold said arm away from said contact, means for moving the cut-out against gravity to closed position as the controller arm is moved to the dead point, a detent adapted to hold said arm in position after being closed, the end of said arm having an elongated riding surface on which. the head of said detent is adapted to ride, an electromagnet' operated by an excess current through the controlle arm, a core in said magnet, a collar on said core, said collarbeingadapted to move said detent and release said arm when the core is raised. by the energization of the magnet.

2. In an electric controller the combination of the controller arm adapted to make contact with the resistance conta ts and with a dead point, a cut-out arm, a stud on which said arm is mounted, said stud serving as one te animal, a Ushaped contact having inflexible legs against which said arm is adapted to be forced against gravity, means for forcing said arm into said contact as the controller arm is moved to the dead point, a detent adapted to hold said arm in closed position and an electro-magnet operated by an excess current through the controller arm for releasing said detent, said. arm having an elongated riding surface ad jacent the end thereof on which the head of said detent is adapted to ride as said arm is being forced into contact position.

In testimony whereof I have signed my name to this specification in the present-c of two subscribing Witnesses LOUISA. DE MAYO.

Witnesses ISAAC B. OWENS, B. BIGGE. 

